A man originally convicted of Aggravated Criminal Sexual Abuse on August 27, 2008, in Saint Clair County, Illinois, was sentenced yesterday in federal district court, in East Saint Louis, Illinois, on one count of failure to register as a sex offender, according to the United States Attorney for the Southern District of Illinois, Stephen R. Wigginton.  37-year old Demarcus A. Buford, of Jefferson City, Missouri, was sentenced to 2 and a half years in federal prison; five years supervised release, and ordered to pay a $100 special assessment and a $150 fine.   Buford moved from Illinois to Missouri, after signing an Illinois Sex Offender Registration Act Notification Form on January 15, 2013, acknowledging his requirement to either update his sex offender registration in Illinois to reflect his change of address, or register as a sex offender in Missouri.  He neither registered in Missouri, nor updated his registration in Illinois as required by law.